Motor generator with external rotor

Abstract

The invention provides a motor generator with an external rotor. The motor generator with the external rotor comprises a shaft (1), a shell (3), a stator magnet yoke (4), an N-pole stator core (5), an S-pole stator core (10), an N-pole stator core (7), an S-pole stator core (11), an armature winding and an exciting winding (8), wherein the N-pole stator core (5) and the S-pole stator core (10) are arranged in the axial direction in a separated mode, the number of poles of the N-pole stator core (5) and the number of poles of the S-pole stator core (10) are 3n, and the exciting winding (8) is arranged between the two stator cores; the N-pole stator core (7) and the S-pole stator core (11) are arranged in the axial direction in a separated mode, the number of poles of the N-pole stator core (7) and the number of poles of the S-pole stator core (11) are equal and are 2n or 4n, and the difference angle between the N-pole stator core (7) and the S-pole stator core (11) in the circumferential direction is 360 / 4n degrees or 360 / 8n degrees. According to the motor generator, the exciting winding is small in circumferential size and low in consumption of enameled wires and copper loss; the path of magnetic circuits is short, most of the magnetic circuits pass through a silicon steel sheet, and therefore the iron loss is low; coils on an N-pole stator pole and coils on an S-pole stator pole can be effectively complemented with each other; the motor generator is provided with a flywheel type external rotor structure, and can work in a power-driven mode and work through electricity generation.

Description

technical field [0001] The invention relates to an outer rotor motor generator, which belongs to the technical field of motors and electrical appliances. Background technique [0002] A motor-generator can operate both as a motor and as a generator. Both the starter engine and drive motor for automobiles should have these two functions to supply power to electrical equipment after starting, or to recover braking energy after driving the car. [0003] At present, synchronous motors with electric excitation are widely used in automobiles because they have the ability of fault de-excitation and high-speed field weakening, and can better regulate voltage. [0004] The generator on the traditional automobile generally adopts the excitation method with a carbon brush slip ring structure. In order to achieve brushless excitation, technicians have proposed a brushless alternator with only claw poles rotating, but this kind of generator has more air gaps and lower specific power. ...

AI Technical Summary

Problems solved by technology

[0007] At present, the applicant has not retrieved a technical solution in which the excitation winding is excited in the middle and forms two sets of mutually complementary windings

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